You don't need to buy Photoshop in order to get started with image editing.

Gimp.org is an excellent source for FREE image-editing software, and it does pretty much all the basic things that Photoshop does.

If you already own Photoshop, but you are away from your home computer and need to make changes to already existing images on your website, you can download Gimp in a pinch and make those changes while you are on the road.

Gimp is simple to set up: You will be editing your images in no time and all, and at no cost to you.